"Elfyn Edwards, a fire safety expert and former firefighter, told the BBC the stay put policy was designed to stop residents in flats unaffected by fire from unnecessarily evacuating the building and blocking the stairways.
Usually the way tower blocks are designed means a fire breaking out in one flat should not spread throughout the rest of a building.
Should you stay put?
LFB said: "Our guidance to 'Stay Put', unless your flat is being affected by fire or smoke, is based on the fire protection provided in the building and the walls and doors of each flat.
"This has been the case for many decades and, although fires in flats unfortunately occur throughout the country every day, the fire usually only affects the flat on fire.
"However, some smoke may enter corridors when the residents leave the flat on fire, or firefighters enter the flat to extinguish the fire.
"By staying put it will reduce the risk of you entering a smoky corridor unnecessarily and potentially being overcome by smoke. It will also allow our firefighters to tackle the fire safely and quickly without being delayed by many residents evacuating down the stairways."
The Local Government Association, which represents councils, said the stay put policy was not intended to deter people from leaving the building if they felt threatened.
In the case of Grenfell Tower, the speed at which the fire engulfed the block was unprecedented, Mr Edwards said.
Michael Paramasivan, who lived on the seventh floor of Grenfell Tower with his girlfriend and young daughter, said he ignored official advice to stay in your home.
"If we had stayed in that flat, we would've perished. My gut instinct told me just to get the girls out. I wrapped the little one up because of the smoke and I just got them out."
London mayor Sadiq Khan told BBC Radio 4 there would now be questions asked of the wisdom of following the stay put advice."
www.bbc.co.uk/news/uk-england-london-40380163
Can you imagine this sort of advice being issued in a factory or an office block. The first thing on hearing a fire alarm is always leave your stuff and evacuate.
The better safe than sorry advice should always apply in my view.